Living pictures; their history, photoproduction and practical working. With a digest of British patents and annotated bibliography (1899)

Record Details:

Title:
Living pictures; their history, photoproduction and practical working. With a digest of British patents and annotated bibliography
Date:
1899
Publisher:
London Optician & Photographic Trades Review
Volume:
Living pictures; their history, photoproduction and practical working. With a digest of British patents and annotated bibliography
Leaf #:
00085
Language:
English
Collection:
Books
Format:
Books
Contributor:
Robarts - University of Toronto
Sponsor:
University of Toronto
Coordinator:
Media History Digital Library
Description:
52
Date Added:
July 19, 2022
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CHItONO-PHOTOGJRAPJIY, C7 August, 1889, Messrs. Donisthorpe and Crofts filed a specification in which they showed another means for securing a stationary fihii during the period of exposure or projection. This device was ingenious, the film being in continual process of unrolling from one spool and rolling on the other, and yet the portion in use was kept stationary opposite the lens without any sudden pull to change the portion exposed. The film passed from •one spool to another at a continuous speed past the exposure opening, but this movement was period- ically neutralised by lifting film, rollers and all, at a speed equal to the downward mo- tion of the film by means of a crank- motion, the whole frame being steadied by rollers (shown black on drawing) running between guides (Fig. 69). Thus a portion of film opposite the lens was continually travelling nearer to the bottom roller, but was also being raised at an equal speed; the same piece of film therefore remained in the same place during exposure. This terminated, the whole frame sank to a sufficient extent to expose the Fig. 69.